Also think about this. Rock evolved from the blues. Any time you are listening to JS Bach, listen to the bass line. If he was alive fifty years ago, he would have fit right in with the times with that boom boom.

A problem with music as a business is that everything is categorized. Not just determining which genre or style a piece must be labeled, but also the demographic of the market that is targeted. That is something that takes some of the soul out of it. Any piece really could be reworked or rearranged into any style. There is no limit.